Merge pull request #7665 from bbodenmiller/rm-chmod

doc/update/6.0-to-6.1.md

doc/update/6.1-to-6.2.md

doc/update/6.2-to-6.3.md

doc/update/6.7-to-6.8.md

doc/update/6.9-to-7.0.md

doc/update/7.0-to-7.1.md

doc/update/7.1-to-7.2.md